function onChange(event) { var file = event.target.files[0]; var reader = new FileReader(); reader.onload = function(event) { let self = this; window.crypto.subtle.generateKey({ name: "AES-CBC", length: 128 }, true, ["encrypt", "decrypt"]) .then(function(key){ var arrayBuffer = self.result; var array = new Uint8Array(arrayBuffer); var random_iv = window.crypto.getRandomValues(new Uint8Array(16)); window.crypto.subtle.encrypt({ name: "AES-CBC", iv: random_iv }, key, array) .then(function(encrypted){ var dataView = new DataView(encrypted); var blob = new Blob([dataView], { type: file.type }); var fd = new FormData(); fd.append("fname", file.name); fd.append("data", blob, file.name); var xhr = new XMLHttpRequest(); var hex = ivToStr(random_iv); xhr.open("post", "/upload/" + hex, true); var li = document.createElement("li"); var name = document.createElement("p"); name.innerHTML = file.name; li.appendChild(name); var link = document.createElement("a"); li.appendChild(link); var progress = document.createElement("p"); li.appendChild(progress); document.getElementById("uploaded_files").appendChild(li); xhr.upload.addEventListener("progress", returnBindedLI(progress, name, link, li)); xhr.onreadystatechange = function() { if (xhr.readyState == XMLHttpRequest.DONE) { window.crypto.subtle.exportKey("jwk", key).then(function(keydata) { var curr_name = localStorage.getItem(file.name); localStorage.setItem(hex, xhr.responseText); link.innerHTML = "http://localhost:3000/download/" + hex + "/#" + keydata.k; link.setAttribute("href", "http://localhost:3000/download/" + hex + "/#" + keydata.k); console.log("Share this link with a friend: http://localhost:3000/download/" + hex + "/#" + keydata.k); }) } }; xhr.send(fd); }) .catch(function(err){ console.error(err); }); }) .catch(function(err){ console.error(err); }); }; reader.readAsArrayBuffer(file); } function ivToStr(iv) { let hexStr = ""; for (var i in iv) { if (iv[i] < 16) { hexStr += "0" + iv[i].toString(16); } else { hexStr += iv[i].toString(16); } } window.hexStr = hexStr; return hexStr; } function strToIv(str) { var iv = new Uint8Array(16); for (var i = 0; i < str.length; i += 2) { iv[i/2] = parseInt((str.charAt(i) + str.charAt(i + 1)), 16); } return iv; } function returnBindedLI(a_element, name, link, li) { return function updateProgress(e) { if (e.lengthComputable) { var percentComplete = Math.floor((e.loaded / e.total) * 100); a_element.innerHTML = "Progress: " + percentComplete + "%"; if (percentComplete === 100) { var btn = document.createElement("button"); btn.innerHTML = "Delete from server"; btn.addEventListener("click", function() { var segments = link.innerHTML.split("/"); var key = segments[segments.length - 2]; var xhr = new XMLHttpRequest(); xhr.open("post", "/delete/" + key, true); xhr.setRequestHeader("Content-Type", "application/json"); if (!localStorage.getItem(key)) return; xhr.send(JSON.stringify({delete_token: localStorage.getItem(key)})); xhr.onreadystatechange = function() { if (xhr.readyState === XMLHttpRequest.DONE) { document.getElementById("uploaded_files").removeChild(li); localStorage.removeItem(key); } if (xhr.status === 200) { console.log("The file was successfully deleted."); } else { console.log("The file has expired, or has already been deleted."); } } }); li.appendChild(btn); } } } }